1 /* xfrm_user.c: User interface to configure xfrm engine. 2 * 3 * Copyright (C) 2002 David S. Miller (davem@redhat.com) 4 * 5 * Changes: 6 * Mitsuru KANDA @USAGI 7 * Kazunori MIYAZAWA @USAGI 8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 9 * IPv6 support 10 * 11 */ 12 13 #include <linux/crypto.h> 14 #include <linux/module.h> 15 #include <linux/kernel.h> 16 #include <linux/types.h> 17 #include <linux/slab.h> 18 #include <linux/socket.h> 19 #include <linux/string.h> 20 #include <linux/net.h> 21 #include <linux/skbuff.h> 22 #include <linux/pfkeyv2.h> 23 #include <linux/ipsec.h> 24 #include <linux/init.h> 25 #include <linux/security.h> 26 #include <net/sock.h> 27 #include <net/xfrm.h> 28 #include <net/netlink.h> 29 #include <asm/uaccess.h> 30 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 31 #include <linux/in6.h> 32 #endif 33 34 static inline int aead_len(struct xfrm_algo_aead *alg) 35 { 36 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 37 } 38 39 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type) 40 { 41 struct nlattr *rt = attrs[type]; 42 struct xfrm_algo *algp; 43 44 if (!rt) 45 return 0; 46 47 algp = nla_data(rt); 48 if (nla_len(rt) < xfrm_alg_len(algp)) 49 return -EINVAL; 50 51 switch (type) { 52 case XFRMA_ALG_AUTH: 53 case XFRMA_ALG_CRYPT: 54 case XFRMA_ALG_COMP: 55 break; 56 57 default: 58 return -EINVAL; 59 } 60 61 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 62 return 0; 63 } 64 65 static int verify_aead(struct nlattr **attrs) 66 { 67 struct nlattr *rt = attrs[XFRMA_ALG_AEAD]; 68 struct xfrm_algo_aead *algp; 69 70 if (!rt) 71 return 0; 72 73 algp = nla_data(rt); 74 if (nla_len(rt) < aead_len(algp)) 75 return -EINVAL; 76 77 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 78 return 0; 79 } 80 81 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type, 82 xfrm_address_t **addrp) 83 { 84 struct nlattr *rt = attrs[type]; 85 86 if (rt && addrp) 87 *addrp = nla_data(rt); 88 } 89 90 static inline int verify_sec_ctx_len(struct nlattr **attrs) 91 { 92 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 93 struct xfrm_user_sec_ctx *uctx; 94 95 if (!rt) 96 return 0; 97 98 uctx = nla_data(rt); 99 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) 100 return -EINVAL; 101 102 return 0; 103 } 104 105 106 static int verify_newsa_info(struct xfrm_usersa_info *p, 107 struct nlattr **attrs) 108 { 109 int err; 110 111 err = -EINVAL; 112 switch (p->family) { 113 case AF_INET: 114 break; 115 116 case AF_INET6: 117 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 118 break; 119 #else 120 err = -EAFNOSUPPORT; 121 goto out; 122 #endif 123 124 default: 125 goto out; 126 } 127 128 err = -EINVAL; 129 switch (p->id.proto) { 130 case IPPROTO_AH: 131 if (!attrs[XFRMA_ALG_AUTH] || 132 attrs[XFRMA_ALG_AEAD] || 133 attrs[XFRMA_ALG_CRYPT] || 134 attrs[XFRMA_ALG_COMP]) 135 goto out; 136 break; 137 138 case IPPROTO_ESP: 139 if (attrs[XFRMA_ALG_COMP]) 140 goto out; 141 if (!attrs[XFRMA_ALG_AUTH] && 142 !attrs[XFRMA_ALG_CRYPT] && 143 !attrs[XFRMA_ALG_AEAD]) 144 goto out; 145 if ((attrs[XFRMA_ALG_AUTH] || 146 attrs[XFRMA_ALG_CRYPT]) && 147 attrs[XFRMA_ALG_AEAD]) 148 goto out; 149 break; 150 151 case IPPROTO_COMP: 152 if (!attrs[XFRMA_ALG_COMP] || 153 attrs[XFRMA_ALG_AEAD] || 154 attrs[XFRMA_ALG_AUTH] || 155 attrs[XFRMA_ALG_CRYPT]) 156 goto out; 157 break; 158 159 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 160 case IPPROTO_DSTOPTS: 161 case IPPROTO_ROUTING: 162 if (attrs[XFRMA_ALG_COMP] || 163 attrs[XFRMA_ALG_AUTH] || 164 attrs[XFRMA_ALG_AEAD] || 165 attrs[XFRMA_ALG_CRYPT] || 166 attrs[XFRMA_ENCAP] || 167 attrs[XFRMA_SEC_CTX] || 168 !attrs[XFRMA_COADDR]) 169 goto out; 170 break; 171 #endif 172 173 default: 174 goto out; 175 } 176 177 if ((err = verify_aead(attrs))) 178 goto out; 179 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH))) 180 goto out; 181 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT))) 182 goto out; 183 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP))) 184 goto out; 185 if ((err = verify_sec_ctx_len(attrs))) 186 goto out; 187 188 err = -EINVAL; 189 switch (p->mode) { 190 case XFRM_MODE_TRANSPORT: 191 case XFRM_MODE_TUNNEL: 192 case XFRM_MODE_ROUTEOPTIMIZATION: 193 case XFRM_MODE_BEET: 194 break; 195 196 default: 197 goto out; 198 } 199 200 err = 0; 201 202 out: 203 return err; 204 } 205 206 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, 207 struct xfrm_algo_desc *(*get_byname)(char *, int), 208 struct nlattr *rta) 209 { 210 struct xfrm_algo *p, *ualg; 211 struct xfrm_algo_desc *algo; 212 213 if (!rta) 214 return 0; 215 216 ualg = nla_data(rta); 217 218 algo = get_byname(ualg->alg_name, 1); 219 if (!algo) 220 return -ENOSYS; 221 *props = algo->desc.sadb_alg_id; 222 223 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 224 if (!p) 225 return -ENOMEM; 226 227 strcpy(p->alg_name, algo->name); 228 *algpp = p; 229 return 0; 230 } 231 232 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props, 233 struct nlattr *rta) 234 { 235 struct xfrm_algo_aead *p, *ualg; 236 struct xfrm_algo_desc *algo; 237 238 if (!rta) 239 return 0; 240 241 ualg = nla_data(rta); 242 243 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); 244 if (!algo) 245 return -ENOSYS; 246 *props = algo->desc.sadb_alg_id; 247 248 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); 249 if (!p) 250 return -ENOMEM; 251 252 strcpy(p->alg_name, algo->name); 253 *algpp = p; 254 return 0; 255 } 256 257 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) 258 { 259 int len = 0; 260 261 if (xfrm_ctx) { 262 len += sizeof(struct xfrm_user_sec_ctx); 263 len += xfrm_ctx->ctx_len; 264 } 265 return len; 266 } 267 268 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 269 { 270 memcpy(&x->id, &p->id, sizeof(x->id)); 271 memcpy(&x->sel, &p->sel, sizeof(x->sel)); 272 memcpy(&x->lft, &p->lft, sizeof(x->lft)); 273 x->props.mode = p->mode; 274 x->props.replay_window = p->replay_window; 275 x->props.reqid = p->reqid; 276 x->props.family = p->family; 277 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); 278 x->props.flags = p->flags; 279 280 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) 281 x->sel.family = p->family; 282 } 283 284 /* 285 * someday when pfkey also has support, we could have the code 286 * somehow made shareable and move it to xfrm_state.c - JHS 287 * 288 */ 289 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs) 290 { 291 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 292 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 293 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 294 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 295 296 if (rp) { 297 struct xfrm_replay_state *replay; 298 replay = nla_data(rp); 299 memcpy(&x->replay, replay, sizeof(*replay)); 300 memcpy(&x->preplay, replay, sizeof(*replay)); 301 } 302 303 if (lt) { 304 struct xfrm_lifetime_cur *ltime; 305 ltime = nla_data(lt); 306 x->curlft.bytes = ltime->bytes; 307 x->curlft.packets = ltime->packets; 308 x->curlft.add_time = ltime->add_time; 309 x->curlft.use_time = ltime->use_time; 310 } 311 312 if (et) 313 x->replay_maxage = nla_get_u32(et); 314 315 if (rt) 316 x->replay_maxdiff = nla_get_u32(rt); 317 } 318 319 static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p, 320 struct nlattr **attrs, 321 int *errp) 322 { 323 struct xfrm_state *x = xfrm_state_alloc(); 324 int err = -ENOMEM; 325 326 if (!x) 327 goto error_no_put; 328 329 copy_from_user_state(x, p); 330 331 if ((err = attach_aead(&x->aead, &x->props.ealgo, 332 attrs[XFRMA_ALG_AEAD]))) 333 goto error; 334 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo, 335 xfrm_aalg_get_byname, 336 attrs[XFRMA_ALG_AUTH]))) 337 goto error; 338 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo, 339 xfrm_ealg_get_byname, 340 attrs[XFRMA_ALG_CRYPT]))) 341 goto error; 342 if ((err = attach_one_algo(&x->calg, &x->props.calgo, 343 xfrm_calg_get_byname, 344 attrs[XFRMA_ALG_COMP]))) 345 goto error; 346 347 if (attrs[XFRMA_ENCAP]) { 348 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 349 sizeof(*x->encap), GFP_KERNEL); 350 if (x->encap == NULL) 351 goto error; 352 } 353 354 if (attrs[XFRMA_COADDR]) { 355 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), 356 sizeof(*x->coaddr), GFP_KERNEL); 357 if (x->coaddr == NULL) 358 goto error; 359 } 360 361 err = xfrm_init_state(x); 362 if (err) 363 goto error; 364 365 if (attrs[XFRMA_SEC_CTX] && 366 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX]))) 367 goto error; 368 369 x->km.seq = p->seq; 370 x->replay_maxdiff = sysctl_xfrm_aevent_rseqth; 371 /* sysctl_xfrm_aevent_etime is in 100ms units */ 372 x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M; 373 x->preplay.bitmap = 0; 374 x->preplay.seq = x->replay.seq+x->replay_maxdiff; 375 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff; 376 377 /* override default values from above */ 378 379 xfrm_update_ae_params(x, attrs); 380 381 return x; 382 383 error: 384 x->km.state = XFRM_STATE_DEAD; 385 xfrm_state_put(x); 386 error_no_put: 387 *errp = err; 388 return NULL; 389 } 390 391 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 392 struct nlattr **attrs) 393 { 394 struct xfrm_usersa_info *p = nlmsg_data(nlh); 395 struct xfrm_state *x; 396 int err; 397 struct km_event c; 398 uid_t loginuid = NETLINK_CB(skb).loginuid; 399 u32 sessionid = NETLINK_CB(skb).sessionid; 400 u32 sid = NETLINK_CB(skb).sid; 401 402 err = verify_newsa_info(p, attrs); 403 if (err) 404 return err; 405 406 x = xfrm_state_construct(p, attrs, &err); 407 if (!x) 408 return err; 409 410 xfrm_state_hold(x); 411 if (nlh->nlmsg_type == XFRM_MSG_NEWSA) 412 err = xfrm_state_add(x); 413 else 414 err = xfrm_state_update(x); 415 416 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid); 417 418 if (err < 0) { 419 x->km.state = XFRM_STATE_DEAD; 420 __xfrm_state_put(x); 421 goto out; 422 } 423 424 c.seq = nlh->nlmsg_seq; 425 c.pid = nlh->nlmsg_pid; 426 c.event = nlh->nlmsg_type; 427 428 km_state_notify(x, &c); 429 out: 430 xfrm_state_put(x); 431 return err; 432 } 433 434 static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p, 435 struct nlattr **attrs, 436 int *errp) 437 { 438 struct xfrm_state *x = NULL; 439 int err; 440 441 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { 442 err = -ESRCH; 443 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family); 444 } else { 445 xfrm_address_t *saddr = NULL; 446 447 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); 448 if (!saddr) { 449 err = -EINVAL; 450 goto out; 451 } 452 453 err = -ESRCH; 454 x = xfrm_state_lookup_byaddr(&p->daddr, saddr, p->proto, 455 p->family); 456 } 457 458 out: 459 if (!x && errp) 460 *errp = err; 461 return x; 462 } 463 464 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 465 struct nlattr **attrs) 466 { 467 struct xfrm_state *x; 468 int err = -ESRCH; 469 struct km_event c; 470 struct xfrm_usersa_id *p = nlmsg_data(nlh); 471 uid_t loginuid = NETLINK_CB(skb).loginuid; 472 u32 sessionid = NETLINK_CB(skb).sessionid; 473 u32 sid = NETLINK_CB(skb).sid; 474 475 x = xfrm_user_state_lookup(p, attrs, &err); 476 if (x == NULL) 477 return err; 478 479 if ((err = security_xfrm_state_delete(x)) != 0) 480 goto out; 481 482 if (xfrm_state_kern(x)) { 483 err = -EPERM; 484 goto out; 485 } 486 487 err = xfrm_state_delete(x); 488 489 if (err < 0) 490 goto out; 491 492 c.seq = nlh->nlmsg_seq; 493 c.pid = nlh->nlmsg_pid; 494 c.event = nlh->nlmsg_type; 495 km_state_notify(x, &c); 496 497 out: 498 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid); 499 xfrm_state_put(x); 500 return err; 501 } 502 503 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 504 { 505 memcpy(&p->id, &x->id, sizeof(p->id)); 506 memcpy(&p->sel, &x->sel, sizeof(p->sel)); 507 memcpy(&p->lft, &x->lft, sizeof(p->lft)); 508 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); 509 memcpy(&p->stats, &x->stats, sizeof(p->stats)); 510 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); 511 p->mode = x->props.mode; 512 p->replay_window = x->props.replay_window; 513 p->reqid = x->props.reqid; 514 p->family = x->props.family; 515 p->flags = x->props.flags; 516 p->seq = x->km.seq; 517 } 518 519 struct xfrm_dump_info { 520 struct sk_buff *in_skb; 521 struct sk_buff *out_skb; 522 u32 nlmsg_seq; 523 u16 nlmsg_flags; 524 }; 525 526 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) 527 { 528 struct xfrm_user_sec_ctx *uctx; 529 struct nlattr *attr; 530 int ctx_size = sizeof(*uctx) + s->ctx_len; 531 532 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); 533 if (attr == NULL) 534 return -EMSGSIZE; 535 536 uctx = nla_data(attr); 537 uctx->exttype = XFRMA_SEC_CTX; 538 uctx->len = ctx_size; 539 uctx->ctx_doi = s->ctx_doi; 540 uctx->ctx_alg = s->ctx_alg; 541 uctx->ctx_len = s->ctx_len; 542 memcpy(uctx + 1, s->ctx_str, s->ctx_len); 543 544 return 0; 545 } 546 547 /* Don't change this without updating xfrm_sa_len! */ 548 static int copy_to_user_state_extra(struct xfrm_state *x, 549 struct xfrm_usersa_info *p, 550 struct sk_buff *skb) 551 { 552 copy_to_user_state(x, p); 553 554 if (x->coaddr) 555 NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); 556 557 if (x->lastused) 558 NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused); 559 560 if (x->aead) 561 NLA_PUT(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead); 562 if (x->aalg) 563 NLA_PUT(skb, XFRMA_ALG_AUTH, xfrm_alg_len(x->aalg), x->aalg); 564 if (x->ealg) 565 NLA_PUT(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg); 566 if (x->calg) 567 NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); 568 569 if (x->encap) 570 NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); 571 572 if (x->security && copy_sec_ctx(x->security, skb) < 0) 573 goto nla_put_failure; 574 575 return 0; 576 577 nla_put_failure: 578 return -EMSGSIZE; 579 } 580 581 static int dump_one_state(struct xfrm_state *x, int count, void *ptr) 582 { 583 struct xfrm_dump_info *sp = ptr; 584 struct sk_buff *in_skb = sp->in_skb; 585 struct sk_buff *skb = sp->out_skb; 586 struct xfrm_usersa_info *p; 587 struct nlmsghdr *nlh; 588 int err; 589 590 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq, 591 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); 592 if (nlh == NULL) 593 return -EMSGSIZE; 594 595 p = nlmsg_data(nlh); 596 597 err = copy_to_user_state_extra(x, p, skb); 598 if (err) 599 goto nla_put_failure; 600 601 nlmsg_end(skb, nlh); 602 return 0; 603 604 nla_put_failure: 605 nlmsg_cancel(skb, nlh); 606 return err; 607 } 608 609 static int xfrm_dump_sa_done(struct netlink_callback *cb) 610 { 611 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 612 xfrm_state_walk_done(walk); 613 return 0; 614 } 615 616 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) 617 { 618 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 619 struct xfrm_dump_info info; 620 621 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > 622 sizeof(cb->args) - sizeof(cb->args[0])); 623 624 info.in_skb = cb->skb; 625 info.out_skb = skb; 626 info.nlmsg_seq = cb->nlh->nlmsg_seq; 627 info.nlmsg_flags = NLM_F_MULTI; 628 629 if (!cb->args[0]) { 630 cb->args[0] = 1; 631 xfrm_state_walk_init(walk, 0); 632 } 633 634 (void) xfrm_state_walk(walk, dump_one_state, &info); 635 636 return skb->len; 637 } 638 639 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, 640 struct xfrm_state *x, u32 seq) 641 { 642 struct xfrm_dump_info info; 643 struct sk_buff *skb; 644 645 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 646 if (!skb) 647 return ERR_PTR(-ENOMEM); 648 649 info.in_skb = in_skb; 650 info.out_skb = skb; 651 info.nlmsg_seq = seq; 652 info.nlmsg_flags = 0; 653 654 if (dump_one_state(x, 0, &info)) { 655 kfree_skb(skb); 656 return NULL; 657 } 658 659 return skb; 660 } 661 662 static inline size_t xfrm_spdinfo_msgsize(void) 663 { 664 return NLMSG_ALIGN(4) 665 + nla_total_size(sizeof(struct xfrmu_spdinfo)) 666 + nla_total_size(sizeof(struct xfrmu_spdhinfo)); 667 } 668 669 static int build_spdinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags) 670 { 671 struct xfrmk_spdinfo si; 672 struct xfrmu_spdinfo spc; 673 struct xfrmu_spdhinfo sph; 674 struct nlmsghdr *nlh; 675 u32 *f; 676 677 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); 678 if (nlh == NULL) /* shouldnt really happen ... */ 679 return -EMSGSIZE; 680 681 f = nlmsg_data(nlh); 682 *f = flags; 683 xfrm_spd_getinfo(&si); 684 spc.incnt = si.incnt; 685 spc.outcnt = si.outcnt; 686 spc.fwdcnt = si.fwdcnt; 687 spc.inscnt = si.inscnt; 688 spc.outscnt = si.outscnt; 689 spc.fwdscnt = si.fwdscnt; 690 sph.spdhcnt = si.spdhcnt; 691 sph.spdhmcnt = si.spdhmcnt; 692 693 NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); 694 NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); 695 696 return nlmsg_end(skb, nlh); 697 698 nla_put_failure: 699 nlmsg_cancel(skb, nlh); 700 return -EMSGSIZE; 701 } 702 703 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 704 struct nlattr **attrs) 705 { 706 struct sk_buff *r_skb; 707 u32 *flags = nlmsg_data(nlh); 708 u32 spid = NETLINK_CB(skb).pid; 709 u32 seq = nlh->nlmsg_seq; 710 711 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); 712 if (r_skb == NULL) 713 return -ENOMEM; 714 715 if (build_spdinfo(r_skb, spid, seq, *flags) < 0) 716 BUG(); 717 718 return nlmsg_unicast(xfrm_nl, r_skb, spid); 719 } 720 721 static inline size_t xfrm_sadinfo_msgsize(void) 722 { 723 return NLMSG_ALIGN(4) 724 + nla_total_size(sizeof(struct xfrmu_sadhinfo)) 725 + nla_total_size(4); /* XFRMA_SAD_CNT */ 726 } 727 728 static int build_sadinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags) 729 { 730 struct xfrmk_sadinfo si; 731 struct xfrmu_sadhinfo sh; 732 struct nlmsghdr *nlh; 733 u32 *f; 734 735 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); 736 if (nlh == NULL) /* shouldnt really happen ... */ 737 return -EMSGSIZE; 738 739 f = nlmsg_data(nlh); 740 *f = flags; 741 xfrm_sad_getinfo(&si); 742 743 sh.sadhmcnt = si.sadhmcnt; 744 sh.sadhcnt = si.sadhcnt; 745 746 NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt); 747 NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); 748 749 return nlmsg_end(skb, nlh); 750 751 nla_put_failure: 752 nlmsg_cancel(skb, nlh); 753 return -EMSGSIZE; 754 } 755 756 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 757 struct nlattr **attrs) 758 { 759 struct sk_buff *r_skb; 760 u32 *flags = nlmsg_data(nlh); 761 u32 spid = NETLINK_CB(skb).pid; 762 u32 seq = nlh->nlmsg_seq; 763 764 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); 765 if (r_skb == NULL) 766 return -ENOMEM; 767 768 if (build_sadinfo(r_skb, spid, seq, *flags) < 0) 769 BUG(); 770 771 return nlmsg_unicast(xfrm_nl, r_skb, spid); 772 } 773 774 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 775 struct nlattr **attrs) 776 { 777 struct xfrm_usersa_id *p = nlmsg_data(nlh); 778 struct xfrm_state *x; 779 struct sk_buff *resp_skb; 780 int err = -ESRCH; 781 782 x = xfrm_user_state_lookup(p, attrs, &err); 783 if (x == NULL) 784 goto out_noput; 785 786 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 787 if (IS_ERR(resp_skb)) { 788 err = PTR_ERR(resp_skb); 789 } else { 790 err = nlmsg_unicast(xfrm_nl, resp_skb, NETLINK_CB(skb).pid); 791 } 792 xfrm_state_put(x); 793 out_noput: 794 return err; 795 } 796 797 static int verify_userspi_info(struct xfrm_userspi_info *p) 798 { 799 switch (p->info.id.proto) { 800 case IPPROTO_AH: 801 case IPPROTO_ESP: 802 break; 803 804 case IPPROTO_COMP: 805 /* IPCOMP spi is 16-bits. */ 806 if (p->max >= 0x10000) 807 return -EINVAL; 808 break; 809 810 default: 811 return -EINVAL; 812 } 813 814 if (p->min > p->max) 815 return -EINVAL; 816 817 return 0; 818 } 819 820 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, 821 struct nlattr **attrs) 822 { 823 struct xfrm_state *x; 824 struct xfrm_userspi_info *p; 825 struct sk_buff *resp_skb; 826 xfrm_address_t *daddr; 827 int family; 828 int err; 829 830 p = nlmsg_data(nlh); 831 err = verify_userspi_info(p); 832 if (err) 833 goto out_noput; 834 835 family = p->info.family; 836 daddr = &p->info.id.daddr; 837 838 x = NULL; 839 if (p->info.seq) { 840 x = xfrm_find_acq_byseq(p->info.seq); 841 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) { 842 xfrm_state_put(x); 843 x = NULL; 844 } 845 } 846 847 if (!x) 848 x = xfrm_find_acq(p->info.mode, p->info.reqid, 849 p->info.id.proto, daddr, 850 &p->info.saddr, 1, 851 family); 852 err = -ENOENT; 853 if (x == NULL) 854 goto out_noput; 855 856 err = xfrm_alloc_spi(x, p->min, p->max); 857 if (err) 858 goto out; 859 860 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 861 if (IS_ERR(resp_skb)) { 862 err = PTR_ERR(resp_skb); 863 goto out; 864 } 865 866 err = nlmsg_unicast(xfrm_nl, resp_skb, NETLINK_CB(skb).pid); 867 868 out: 869 xfrm_state_put(x); 870 out_noput: 871 return err; 872 } 873 874 static int verify_policy_dir(u8 dir) 875 { 876 switch (dir) { 877 case XFRM_POLICY_IN: 878 case XFRM_POLICY_OUT: 879 case XFRM_POLICY_FWD: 880 break; 881 882 default: 883 return -EINVAL; 884 } 885 886 return 0; 887 } 888 889 static int verify_policy_type(u8 type) 890 { 891 switch (type) { 892 case XFRM_POLICY_TYPE_MAIN: 893 #ifdef CONFIG_XFRM_SUB_POLICY 894 case XFRM_POLICY_TYPE_SUB: 895 #endif 896 break; 897 898 default: 899 return -EINVAL; 900 } 901 902 return 0; 903 } 904 905 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) 906 { 907 switch (p->share) { 908 case XFRM_SHARE_ANY: 909 case XFRM_SHARE_SESSION: 910 case XFRM_SHARE_USER: 911 case XFRM_SHARE_UNIQUE: 912 break; 913 914 default: 915 return -EINVAL; 916 } 917 918 switch (p->action) { 919 case XFRM_POLICY_ALLOW: 920 case XFRM_POLICY_BLOCK: 921 break; 922 923 default: 924 return -EINVAL; 925 } 926 927 switch (p->sel.family) { 928 case AF_INET: 929 break; 930 931 case AF_INET6: 932 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 933 break; 934 #else 935 return -EAFNOSUPPORT; 936 #endif 937 938 default: 939 return -EINVAL; 940 } 941 942 return verify_policy_dir(p->dir); 943 } 944 945 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) 946 { 947 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 948 struct xfrm_user_sec_ctx *uctx; 949 950 if (!rt) 951 return 0; 952 953 uctx = nla_data(rt); 954 return security_xfrm_policy_alloc(&pol->security, uctx); 955 } 956 957 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, 958 int nr) 959 { 960 int i; 961 962 xp->xfrm_nr = nr; 963 for (i = 0; i < nr; i++, ut++) { 964 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 965 966 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); 967 memcpy(&t->saddr, &ut->saddr, 968 sizeof(xfrm_address_t)); 969 t->reqid = ut->reqid; 970 t->mode = ut->mode; 971 t->share = ut->share; 972 t->optional = ut->optional; 973 t->aalgos = ut->aalgos; 974 t->ealgos = ut->ealgos; 975 t->calgos = ut->calgos; 976 /* If all masks are ~0, then we allow all algorithms. */ 977 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); 978 t->encap_family = ut->family; 979 } 980 } 981 982 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) 983 { 984 int i; 985 986 if (nr > XFRM_MAX_DEPTH) 987 return -EINVAL; 988 989 for (i = 0; i < nr; i++) { 990 /* We never validated the ut->family value, so many 991 * applications simply leave it at zero. The check was 992 * never made and ut->family was ignored because all 993 * templates could be assumed to have the same family as 994 * the policy itself. Now that we will have ipv4-in-ipv6 995 * and ipv6-in-ipv4 tunnels, this is no longer true. 996 */ 997 if (!ut[i].family) 998 ut[i].family = family; 999 1000 switch (ut[i].family) { 1001 case AF_INET: 1002 break; 1003 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1004 case AF_INET6: 1005 break; 1006 #endif 1007 default: 1008 return -EINVAL; 1009 } 1010 } 1011 1012 return 0; 1013 } 1014 1015 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) 1016 { 1017 struct nlattr *rt = attrs[XFRMA_TMPL]; 1018 1019 if (!rt) { 1020 pol->xfrm_nr = 0; 1021 } else { 1022 struct xfrm_user_tmpl *utmpl = nla_data(rt); 1023 int nr = nla_len(rt) / sizeof(*utmpl); 1024 int err; 1025 1026 err = validate_tmpl(nr, utmpl, pol->family); 1027 if (err) 1028 return err; 1029 1030 copy_templates(pol, utmpl, nr); 1031 } 1032 return 0; 1033 } 1034 1035 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) 1036 { 1037 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; 1038 struct xfrm_userpolicy_type *upt; 1039 u8 type = XFRM_POLICY_TYPE_MAIN; 1040 int err; 1041 1042 if (rt) { 1043 upt = nla_data(rt); 1044 type = upt->type; 1045 } 1046 1047 err = verify_policy_type(type); 1048 if (err) 1049 return err; 1050 1051 *tp = type; 1052 return 0; 1053 } 1054 1055 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 1056 { 1057 xp->priority = p->priority; 1058 xp->index = p->index; 1059 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 1060 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 1061 xp->action = p->action; 1062 xp->flags = p->flags; 1063 xp->family = p->sel.family; 1064 /* XXX xp->share = p->share; */ 1065 } 1066 1067 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 1068 { 1069 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 1070 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 1071 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 1072 p->priority = xp->priority; 1073 p->index = xp->index; 1074 p->sel.family = xp->family; 1075 p->dir = dir; 1076 p->action = xp->action; 1077 p->flags = xp->flags; 1078 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 1079 } 1080 1081 static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) 1082 { 1083 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL); 1084 int err; 1085 1086 if (!xp) { 1087 *errp = -ENOMEM; 1088 return NULL; 1089 } 1090 1091 copy_from_user_policy(xp, p); 1092 1093 err = copy_from_user_policy_type(&xp->type, attrs); 1094 if (err) 1095 goto error; 1096 1097 if (!(err = copy_from_user_tmpl(xp, attrs))) 1098 err = copy_from_user_sec_ctx(xp, attrs); 1099 if (err) 1100 goto error; 1101 1102 return xp; 1103 error: 1104 *errp = err; 1105 xp->dead = 1; 1106 xfrm_policy_destroy(xp); 1107 return NULL; 1108 } 1109 1110 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1111 struct nlattr **attrs) 1112 { 1113 struct xfrm_userpolicy_info *p = nlmsg_data(nlh); 1114 struct xfrm_policy *xp; 1115 struct km_event c; 1116 int err; 1117 int excl; 1118 uid_t loginuid = NETLINK_CB(skb).loginuid; 1119 u32 sessionid = NETLINK_CB(skb).sessionid; 1120 u32 sid = NETLINK_CB(skb).sid; 1121 1122 err = verify_newpolicy_info(p); 1123 if (err) 1124 return err; 1125 err = verify_sec_ctx_len(attrs); 1126 if (err) 1127 return err; 1128 1129 xp = xfrm_policy_construct(p, attrs, &err); 1130 if (!xp) 1131 return err; 1132 1133 /* shouldnt excl be based on nlh flags?? 1134 * Aha! this is anti-netlink really i.e more pfkey derived 1135 * in netlink excl is a flag and you wouldnt need 1136 * a type XFRM_MSG_UPDPOLICY - JHS */ 1137 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 1138 err = xfrm_policy_insert(p->dir, xp, excl); 1139 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid); 1140 1141 if (err) { 1142 security_xfrm_policy_free(xp->security); 1143 kfree(xp); 1144 return err; 1145 } 1146 1147 c.event = nlh->nlmsg_type; 1148 c.seq = nlh->nlmsg_seq; 1149 c.pid = nlh->nlmsg_pid; 1150 km_policy_notify(xp, p->dir, &c); 1151 1152 xfrm_pol_put(xp); 1153 1154 return 0; 1155 } 1156 1157 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 1158 { 1159 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 1160 int i; 1161 1162 if (xp->xfrm_nr == 0) 1163 return 0; 1164 1165 for (i = 0; i < xp->xfrm_nr; i++) { 1166 struct xfrm_user_tmpl *up = &vec[i]; 1167 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 1168 1169 memcpy(&up->id, &kp->id, sizeof(up->id)); 1170 up->family = kp->encap_family; 1171 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 1172 up->reqid = kp->reqid; 1173 up->mode = kp->mode; 1174 up->share = kp->share; 1175 up->optional = kp->optional; 1176 up->aalgos = kp->aalgos; 1177 up->ealgos = kp->ealgos; 1178 up->calgos = kp->calgos; 1179 } 1180 1181 return nla_put(skb, XFRMA_TMPL, 1182 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); 1183 } 1184 1185 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) 1186 { 1187 if (x->security) { 1188 return copy_sec_ctx(x->security, skb); 1189 } 1190 return 0; 1191 } 1192 1193 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 1194 { 1195 if (xp->security) { 1196 return copy_sec_ctx(xp->security, skb); 1197 } 1198 return 0; 1199 } 1200 static inline size_t userpolicy_type_attrsize(void) 1201 { 1202 #ifdef CONFIG_XFRM_SUB_POLICY 1203 return nla_total_size(sizeof(struct xfrm_userpolicy_type)); 1204 #else 1205 return 0; 1206 #endif 1207 } 1208 1209 #ifdef CONFIG_XFRM_SUB_POLICY 1210 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1211 { 1212 struct xfrm_userpolicy_type upt = { 1213 .type = type, 1214 }; 1215 1216 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); 1217 } 1218 1219 #else 1220 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1221 { 1222 return 0; 1223 } 1224 #endif 1225 1226 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 1227 { 1228 struct xfrm_dump_info *sp = ptr; 1229 struct xfrm_userpolicy_info *p; 1230 struct sk_buff *in_skb = sp->in_skb; 1231 struct sk_buff *skb = sp->out_skb; 1232 struct nlmsghdr *nlh; 1233 1234 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq, 1235 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); 1236 if (nlh == NULL) 1237 return -EMSGSIZE; 1238 1239 p = nlmsg_data(nlh); 1240 copy_to_user_policy(xp, p, dir); 1241 if (copy_to_user_tmpl(xp, skb) < 0) 1242 goto nlmsg_failure; 1243 if (copy_to_user_sec_ctx(xp, skb)) 1244 goto nlmsg_failure; 1245 if (copy_to_user_policy_type(xp->type, skb) < 0) 1246 goto nlmsg_failure; 1247 1248 nlmsg_end(skb, nlh); 1249 return 0; 1250 1251 nlmsg_failure: 1252 nlmsg_cancel(skb, nlh); 1253 return -EMSGSIZE; 1254 } 1255 1256 static int xfrm_dump_policy_done(struct netlink_callback *cb) 1257 { 1258 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1259 1260 xfrm_policy_walk_done(walk); 1261 return 0; 1262 } 1263 1264 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 1265 { 1266 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1267 struct xfrm_dump_info info; 1268 1269 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) > 1270 sizeof(cb->args) - sizeof(cb->args[0])); 1271 1272 info.in_skb = cb->skb; 1273 info.out_skb = skb; 1274 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1275 info.nlmsg_flags = NLM_F_MULTI; 1276 1277 if (!cb->args[0]) { 1278 cb->args[0] = 1; 1279 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); 1280 } 1281 1282 (void) xfrm_policy_walk(walk, dump_one_policy, &info); 1283 1284 return skb->len; 1285 } 1286 1287 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 1288 struct xfrm_policy *xp, 1289 int dir, u32 seq) 1290 { 1291 struct xfrm_dump_info info; 1292 struct sk_buff *skb; 1293 1294 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1295 if (!skb) 1296 return ERR_PTR(-ENOMEM); 1297 1298 info.in_skb = in_skb; 1299 info.out_skb = skb; 1300 info.nlmsg_seq = seq; 1301 info.nlmsg_flags = 0; 1302 1303 if (dump_one_policy(xp, dir, 0, &info) < 0) { 1304 kfree_skb(skb); 1305 return NULL; 1306 } 1307 1308 return skb; 1309 } 1310 1311 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1312 struct nlattr **attrs) 1313 { 1314 struct xfrm_policy *xp; 1315 struct xfrm_userpolicy_id *p; 1316 u8 type = XFRM_POLICY_TYPE_MAIN; 1317 int err; 1318 struct km_event c; 1319 int delete; 1320 1321 p = nlmsg_data(nlh); 1322 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 1323 1324 err = copy_from_user_policy_type(&type, attrs); 1325 if (err) 1326 return err; 1327 1328 err = verify_policy_dir(p->dir); 1329 if (err) 1330 return err; 1331 1332 if (p->index) 1333 xp = xfrm_policy_byid(type, p->dir, p->index, delete, &err); 1334 else { 1335 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1336 struct xfrm_sec_ctx *ctx; 1337 1338 err = verify_sec_ctx_len(attrs); 1339 if (err) 1340 return err; 1341 1342 ctx = NULL; 1343 if (rt) { 1344 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1345 1346 err = security_xfrm_policy_alloc(&ctx, uctx); 1347 if (err) 1348 return err; 1349 } 1350 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, ctx, 1351 delete, &err); 1352 security_xfrm_policy_free(ctx); 1353 } 1354 if (xp == NULL) 1355 return -ENOENT; 1356 1357 if (!delete) { 1358 struct sk_buff *resp_skb; 1359 1360 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 1361 if (IS_ERR(resp_skb)) { 1362 err = PTR_ERR(resp_skb); 1363 } else { 1364 err = nlmsg_unicast(xfrm_nl, resp_skb, 1365 NETLINK_CB(skb).pid); 1366 } 1367 } else { 1368 uid_t loginuid = NETLINK_CB(skb).loginuid; 1369 u32 sessionid = NETLINK_CB(skb).sessionid; 1370 u32 sid = NETLINK_CB(skb).sid; 1371 1372 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid, 1373 sid); 1374 1375 if (err != 0) 1376 goto out; 1377 1378 c.data.byid = p->index; 1379 c.event = nlh->nlmsg_type; 1380 c.seq = nlh->nlmsg_seq; 1381 c.pid = nlh->nlmsg_pid; 1382 km_policy_notify(xp, p->dir, &c); 1383 } 1384 1385 out: 1386 xfrm_pol_put(xp); 1387 return err; 1388 } 1389 1390 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1391 struct nlattr **attrs) 1392 { 1393 struct km_event c; 1394 struct xfrm_usersa_flush *p = nlmsg_data(nlh); 1395 struct xfrm_audit audit_info; 1396 int err; 1397 1398 audit_info.loginuid = NETLINK_CB(skb).loginuid; 1399 audit_info.sessionid = NETLINK_CB(skb).sessionid; 1400 audit_info.secid = NETLINK_CB(skb).sid; 1401 err = xfrm_state_flush(p->proto, &audit_info); 1402 if (err) 1403 return err; 1404 c.data.proto = p->proto; 1405 c.event = nlh->nlmsg_type; 1406 c.seq = nlh->nlmsg_seq; 1407 c.pid = nlh->nlmsg_pid; 1408 km_state_notify(NULL, &c); 1409 1410 return 0; 1411 } 1412 1413 static inline size_t xfrm_aevent_msgsize(void) 1414 { 1415 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) 1416 + nla_total_size(sizeof(struct xfrm_replay_state)) 1417 + nla_total_size(sizeof(struct xfrm_lifetime_cur)) 1418 + nla_total_size(4) /* XFRM_AE_RTHR */ 1419 + nla_total_size(4); /* XFRM_AE_ETHR */ 1420 } 1421 1422 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c) 1423 { 1424 struct xfrm_aevent_id *id; 1425 struct nlmsghdr *nlh; 1426 1427 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 1428 if (nlh == NULL) 1429 return -EMSGSIZE; 1430 1431 id = nlmsg_data(nlh); 1432 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr)); 1433 id->sa_id.spi = x->id.spi; 1434 id->sa_id.family = x->props.family; 1435 id->sa_id.proto = x->id.proto; 1436 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr)); 1437 id->reqid = x->props.reqid; 1438 id->flags = c->data.aevent; 1439 1440 NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay); 1441 NLA_PUT(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft); 1442 1443 if (id->flags & XFRM_AE_RTHR) 1444 NLA_PUT_U32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); 1445 1446 if (id->flags & XFRM_AE_ETHR) 1447 NLA_PUT_U32(skb, XFRMA_ETIMER_THRESH, 1448 x->replay_maxage * 10 / HZ); 1449 1450 return nlmsg_end(skb, nlh); 1451 1452 nla_put_failure: 1453 nlmsg_cancel(skb, nlh); 1454 return -EMSGSIZE; 1455 } 1456 1457 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1458 struct nlattr **attrs) 1459 { 1460 struct xfrm_state *x; 1461 struct sk_buff *r_skb; 1462 int err; 1463 struct km_event c; 1464 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1465 struct xfrm_usersa_id *id = &p->sa_id; 1466 1467 r_skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC); 1468 if (r_skb == NULL) 1469 return -ENOMEM; 1470 1471 x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family); 1472 if (x == NULL) { 1473 kfree_skb(r_skb); 1474 return -ESRCH; 1475 } 1476 1477 /* 1478 * XXX: is this lock really needed - none of the other 1479 * gets lock (the concern is things getting updated 1480 * while we are still reading) - jhs 1481 */ 1482 spin_lock_bh(&x->lock); 1483 c.data.aevent = p->flags; 1484 c.seq = nlh->nlmsg_seq; 1485 c.pid = nlh->nlmsg_pid; 1486 1487 if (build_aevent(r_skb, x, &c) < 0) 1488 BUG(); 1489 err = nlmsg_unicast(xfrm_nl, r_skb, NETLINK_CB(skb).pid); 1490 spin_unlock_bh(&x->lock); 1491 xfrm_state_put(x); 1492 return err; 1493 } 1494 1495 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1496 struct nlattr **attrs) 1497 { 1498 struct xfrm_state *x; 1499 struct km_event c; 1500 int err = - EINVAL; 1501 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1502 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 1503 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 1504 1505 if (!lt && !rp) 1506 return err; 1507 1508 /* pedantic mode - thou shalt sayeth replaceth */ 1509 if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) 1510 return err; 1511 1512 x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 1513 if (x == NULL) 1514 return -ESRCH; 1515 1516 if (x->km.state != XFRM_STATE_VALID) 1517 goto out; 1518 1519 spin_lock_bh(&x->lock); 1520 xfrm_update_ae_params(x, attrs); 1521 spin_unlock_bh(&x->lock); 1522 1523 c.event = nlh->nlmsg_type; 1524 c.seq = nlh->nlmsg_seq; 1525 c.pid = nlh->nlmsg_pid; 1526 c.data.aevent = XFRM_AE_CU; 1527 km_state_notify(x, &c); 1528 err = 0; 1529 out: 1530 xfrm_state_put(x); 1531 return err; 1532 } 1533 1534 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1535 struct nlattr **attrs) 1536 { 1537 struct km_event c; 1538 u8 type = XFRM_POLICY_TYPE_MAIN; 1539 int err; 1540 struct xfrm_audit audit_info; 1541 1542 err = copy_from_user_policy_type(&type, attrs); 1543 if (err) 1544 return err; 1545 1546 audit_info.loginuid = NETLINK_CB(skb).loginuid; 1547 audit_info.sessionid = NETLINK_CB(skb).sessionid; 1548 audit_info.secid = NETLINK_CB(skb).sid; 1549 err = xfrm_policy_flush(type, &audit_info); 1550 if (err) 1551 return err; 1552 c.data.type = type; 1553 c.event = nlh->nlmsg_type; 1554 c.seq = nlh->nlmsg_seq; 1555 c.pid = nlh->nlmsg_pid; 1556 km_policy_notify(NULL, 0, &c); 1557 return 0; 1558 } 1559 1560 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 1561 struct nlattr **attrs) 1562 { 1563 struct xfrm_policy *xp; 1564 struct xfrm_user_polexpire *up = nlmsg_data(nlh); 1565 struct xfrm_userpolicy_info *p = &up->pol; 1566 u8 type = XFRM_POLICY_TYPE_MAIN; 1567 int err = -ENOENT; 1568 1569 err = copy_from_user_policy_type(&type, attrs); 1570 if (err) 1571 return err; 1572 1573 if (p->index) 1574 xp = xfrm_policy_byid(type, p->dir, p->index, 0, &err); 1575 else { 1576 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1577 struct xfrm_sec_ctx *ctx; 1578 1579 err = verify_sec_ctx_len(attrs); 1580 if (err) 1581 return err; 1582 1583 ctx = NULL; 1584 if (rt) { 1585 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1586 1587 err = security_xfrm_policy_alloc(&ctx, uctx); 1588 if (err) 1589 return err; 1590 } 1591 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, ctx, 0, &err); 1592 security_xfrm_policy_free(ctx); 1593 } 1594 if (xp == NULL) 1595 return -ENOENT; 1596 1597 read_lock(&xp->lock); 1598 if (xp->dead) { 1599 read_unlock(&xp->lock); 1600 goto out; 1601 } 1602 1603 read_unlock(&xp->lock); 1604 err = 0; 1605 if (up->hard) { 1606 uid_t loginuid = NETLINK_CB(skb).loginuid; 1607 uid_t sessionid = NETLINK_CB(skb).sessionid; 1608 u32 sid = NETLINK_CB(skb).sid; 1609 xfrm_policy_delete(xp, p->dir); 1610 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid); 1611 1612 } else { 1613 // reset the timers here? 1614 printk("Dont know what to do with soft policy expire\n"); 1615 } 1616 km_policy_expired(xp, p->dir, up->hard, current->pid); 1617 1618 out: 1619 xfrm_pol_put(xp); 1620 return err; 1621 } 1622 1623 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 1624 struct nlattr **attrs) 1625 { 1626 struct xfrm_state *x; 1627 int err; 1628 struct xfrm_user_expire *ue = nlmsg_data(nlh); 1629 struct xfrm_usersa_info *p = &ue->state; 1630 1631 x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family); 1632 1633 err = -ENOENT; 1634 if (x == NULL) 1635 return err; 1636 1637 spin_lock_bh(&x->lock); 1638 err = -EINVAL; 1639 if (x->km.state != XFRM_STATE_VALID) 1640 goto out; 1641 km_state_expired(x, ue->hard, current->pid); 1642 1643 if (ue->hard) { 1644 uid_t loginuid = NETLINK_CB(skb).loginuid; 1645 uid_t sessionid = NETLINK_CB(skb).sessionid; 1646 u32 sid = NETLINK_CB(skb).sid; 1647 __xfrm_state_delete(x); 1648 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid); 1649 } 1650 err = 0; 1651 out: 1652 spin_unlock_bh(&x->lock); 1653 xfrm_state_put(x); 1654 return err; 1655 } 1656 1657 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, 1658 struct nlattr **attrs) 1659 { 1660 struct xfrm_policy *xp; 1661 struct xfrm_user_tmpl *ut; 1662 int i; 1663 struct nlattr *rt = attrs[XFRMA_TMPL]; 1664 1665 struct xfrm_user_acquire *ua = nlmsg_data(nlh); 1666 struct xfrm_state *x = xfrm_state_alloc(); 1667 int err = -ENOMEM; 1668 1669 if (!x) 1670 return err; 1671 1672 err = verify_newpolicy_info(&ua->policy); 1673 if (err) { 1674 printk("BAD policy passed\n"); 1675 kfree(x); 1676 return err; 1677 } 1678 1679 /* build an XP */ 1680 xp = xfrm_policy_construct(&ua->policy, attrs, &err); 1681 if (!xp) { 1682 kfree(x); 1683 return err; 1684 } 1685 1686 memcpy(&x->id, &ua->id, sizeof(ua->id)); 1687 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 1688 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 1689 1690 ut = nla_data(rt); 1691 /* extract the templates and for each call km_key */ 1692 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 1693 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1694 memcpy(&x->id, &t->id, sizeof(x->id)); 1695 x->props.mode = t->mode; 1696 x->props.reqid = t->reqid; 1697 x->props.family = ut->family; 1698 t->aalgos = ua->aalgos; 1699 t->ealgos = ua->ealgos; 1700 t->calgos = ua->calgos; 1701 err = km_query(x, t, xp); 1702 1703 } 1704 1705 kfree(x); 1706 kfree(xp); 1707 1708 return 0; 1709 } 1710 1711 #ifdef CONFIG_XFRM_MIGRATE 1712 static int copy_from_user_migrate(struct xfrm_migrate *ma, 1713 struct nlattr **attrs, int *num) 1714 { 1715 struct nlattr *rt = attrs[XFRMA_MIGRATE]; 1716 struct xfrm_user_migrate *um; 1717 int i, num_migrate; 1718 1719 um = nla_data(rt); 1720 num_migrate = nla_len(rt) / sizeof(*um); 1721 1722 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) 1723 return -EINVAL; 1724 1725 for (i = 0; i < num_migrate; i++, um++, ma++) { 1726 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); 1727 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); 1728 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); 1729 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); 1730 1731 ma->proto = um->proto; 1732 ma->mode = um->mode; 1733 ma->reqid = um->reqid; 1734 1735 ma->old_family = um->old_family; 1736 ma->new_family = um->new_family; 1737 } 1738 1739 *num = i; 1740 return 0; 1741 } 1742 1743 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 1744 struct nlattr **attrs) 1745 { 1746 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); 1747 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 1748 u8 type; 1749 int err; 1750 int n = 0; 1751 1752 if (attrs[XFRMA_MIGRATE] == NULL) 1753 return -EINVAL; 1754 1755 err = copy_from_user_policy_type(&type, attrs); 1756 if (err) 1757 return err; 1758 1759 err = copy_from_user_migrate((struct xfrm_migrate *)m, 1760 attrs, &n); 1761 if (err) 1762 return err; 1763 1764 if (!n) 1765 return 0; 1766 1767 xfrm_migrate(&pi->sel, pi->dir, type, m, n); 1768 1769 return 0; 1770 } 1771 #else 1772 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 1773 struct nlattr **attrs) 1774 { 1775 return -ENOPROTOOPT; 1776 } 1777 #endif 1778 1779 #ifdef CONFIG_XFRM_MIGRATE 1780 static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb) 1781 { 1782 struct xfrm_user_migrate um; 1783 1784 memset(&um, 0, sizeof(um)); 1785 um.proto = m->proto; 1786 um.mode = m->mode; 1787 um.reqid = m->reqid; 1788 um.old_family = m->old_family; 1789 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 1790 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 1791 um.new_family = m->new_family; 1792 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 1793 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 1794 1795 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); 1796 } 1797 1798 static inline size_t xfrm_migrate_msgsize(int num_migrate) 1799 { 1800 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) 1801 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) 1802 + userpolicy_type_attrsize(); 1803 } 1804 1805 static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m, 1806 int num_migrate, struct xfrm_selector *sel, 1807 u8 dir, u8 type) 1808 { 1809 struct xfrm_migrate *mp; 1810 struct xfrm_userpolicy_id *pol_id; 1811 struct nlmsghdr *nlh; 1812 int i; 1813 1814 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 1815 if (nlh == NULL) 1816 return -EMSGSIZE; 1817 1818 pol_id = nlmsg_data(nlh); 1819 /* copy data from selector, dir, and type to the pol_id */ 1820 memset(pol_id, 0, sizeof(*pol_id)); 1821 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 1822 pol_id->dir = dir; 1823 1824 if (copy_to_user_policy_type(type, skb) < 0) 1825 goto nlmsg_failure; 1826 1827 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 1828 if (copy_to_user_migrate(mp, skb) < 0) 1829 goto nlmsg_failure; 1830 } 1831 1832 return nlmsg_end(skb, nlh); 1833 nlmsg_failure: 1834 nlmsg_cancel(skb, nlh); 1835 return -EMSGSIZE; 1836 } 1837 1838 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 1839 struct xfrm_migrate *m, int num_migrate) 1840 { 1841 struct sk_buff *skb; 1842 1843 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate), GFP_ATOMIC); 1844 if (skb == NULL) 1845 return -ENOMEM; 1846 1847 /* build migrate */ 1848 if (build_migrate(skb, m, num_migrate, sel, dir, type) < 0) 1849 BUG(); 1850 1851 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC); 1852 } 1853 #else 1854 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 1855 struct xfrm_migrate *m, int num_migrate) 1856 { 1857 return -ENOPROTOOPT; 1858 } 1859 #endif 1860 1861 #define XMSGSIZE(type) sizeof(struct type) 1862 1863 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 1864 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 1865 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 1866 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 1867 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 1868 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 1869 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 1870 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 1871 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 1872 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 1873 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 1874 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 1875 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 1876 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 1877 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 1878 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 1879 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 1880 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 1881 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 1882 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 1883 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 1884 }; 1885 1886 #undef XMSGSIZE 1887 1888 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { 1889 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 1890 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 1891 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 1892 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 1893 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 1894 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 1895 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, 1896 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 1897 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 1898 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 1899 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 1900 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 1901 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 1902 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 1903 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 1904 }; 1905 1906 static struct xfrm_link { 1907 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); 1908 int (*dump)(struct sk_buff *, struct netlink_callback *); 1909 int (*done)(struct netlink_callback *); 1910 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 1911 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 1912 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 1913 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 1914 .dump = xfrm_dump_sa, 1915 .done = xfrm_dump_sa_done }, 1916 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 1917 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 1918 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 1919 .dump = xfrm_dump_policy, 1920 .done = xfrm_dump_policy_done }, 1921 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 1922 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 1923 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 1924 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 1925 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 1926 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 1927 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 1928 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 1929 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 1930 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 1931 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 1932 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 1933 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 1934 }; 1935 1936 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 1937 { 1938 struct nlattr *attrs[XFRMA_MAX+1]; 1939 struct xfrm_link *link; 1940 int type, err; 1941 1942 type = nlh->nlmsg_type; 1943 if (type > XFRM_MSG_MAX) 1944 return -EINVAL; 1945 1946 type -= XFRM_MSG_BASE; 1947 link = &xfrm_dispatch[type]; 1948 1949 /* All operations require privileges, even GET */ 1950 if (security_netlink_recv(skb, CAP_NET_ADMIN)) 1951 return -EPERM; 1952 1953 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 1954 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 1955 (nlh->nlmsg_flags & NLM_F_DUMP)) { 1956 if (link->dump == NULL) 1957 return -EINVAL; 1958 1959 return netlink_dump_start(xfrm_nl, skb, nlh, link->dump, link->done); 1960 } 1961 1962 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX, 1963 xfrma_policy); 1964 if (err < 0) 1965 return err; 1966 1967 if (link->doit == NULL) 1968 return -EINVAL; 1969 1970 return link->doit(skb, nlh, attrs); 1971 } 1972 1973 static void xfrm_netlink_rcv(struct sk_buff *skb) 1974 { 1975 mutex_lock(&xfrm_cfg_mutex); 1976 netlink_rcv_skb(skb, &xfrm_user_rcv_msg); 1977 mutex_unlock(&xfrm_cfg_mutex); 1978 } 1979 1980 static inline size_t xfrm_expire_msgsize(void) 1981 { 1982 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)); 1983 } 1984 1985 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c) 1986 { 1987 struct xfrm_user_expire *ue; 1988 struct nlmsghdr *nlh; 1989 1990 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 1991 if (nlh == NULL) 1992 return -EMSGSIZE; 1993 1994 ue = nlmsg_data(nlh); 1995 copy_to_user_state(x, &ue->state); 1996 ue->hard = (c->data.hard != 0) ? 1 : 0; 1997 1998 return nlmsg_end(skb, nlh); 1999 } 2000 2001 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c) 2002 { 2003 struct sk_buff *skb; 2004 2005 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); 2006 if (skb == NULL) 2007 return -ENOMEM; 2008 2009 if (build_expire(skb, x, c) < 0) 2010 BUG(); 2011 2012 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); 2013 } 2014 2015 static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c) 2016 { 2017 struct sk_buff *skb; 2018 2019 skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC); 2020 if (skb == NULL) 2021 return -ENOMEM; 2022 2023 if (build_aevent(skb, x, c) < 0) 2024 BUG(); 2025 2026 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC); 2027 } 2028 2029 static int xfrm_notify_sa_flush(struct km_event *c) 2030 { 2031 struct xfrm_usersa_flush *p; 2032 struct nlmsghdr *nlh; 2033 struct sk_buff *skb; 2034 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); 2035 2036 skb = nlmsg_new(len, GFP_ATOMIC); 2037 if (skb == NULL) 2038 return -ENOMEM; 2039 2040 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 2041 if (nlh == NULL) { 2042 kfree_skb(skb); 2043 return -EMSGSIZE; 2044 } 2045 2046 p = nlmsg_data(nlh); 2047 p->proto = c->data.proto; 2048 2049 nlmsg_end(skb, nlh); 2050 2051 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); 2052 } 2053 2054 static inline size_t xfrm_sa_len(struct xfrm_state *x) 2055 { 2056 size_t l = 0; 2057 if (x->aead) 2058 l += nla_total_size(aead_len(x->aead)); 2059 if (x->aalg) 2060 l += nla_total_size(xfrm_alg_len(x->aalg)); 2061 if (x->ealg) 2062 l += nla_total_size(xfrm_alg_len(x->ealg)); 2063 if (x->calg) 2064 l += nla_total_size(sizeof(*x->calg)); 2065 if (x->encap) 2066 l += nla_total_size(sizeof(*x->encap)); 2067 if (x->security) 2068 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + 2069 x->security->ctx_len); 2070 if (x->coaddr) 2071 l += nla_total_size(sizeof(*x->coaddr)); 2072 2073 /* Must count x->lastused as it may become non-zero behind our back. */ 2074 l += nla_total_size(sizeof(u64)); 2075 2076 return l; 2077 } 2078 2079 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c) 2080 { 2081 struct xfrm_usersa_info *p; 2082 struct xfrm_usersa_id *id; 2083 struct nlmsghdr *nlh; 2084 struct sk_buff *skb; 2085 int len = xfrm_sa_len(x); 2086 int headlen; 2087 2088 headlen = sizeof(*p); 2089 if (c->event == XFRM_MSG_DELSA) { 2090 len += nla_total_size(headlen); 2091 headlen = sizeof(*id); 2092 } 2093 len += NLMSG_ALIGN(headlen); 2094 2095 skb = nlmsg_new(len, GFP_ATOMIC); 2096 if (skb == NULL) 2097 return -ENOMEM; 2098 2099 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0); 2100 if (nlh == NULL) 2101 goto nla_put_failure; 2102 2103 p = nlmsg_data(nlh); 2104 if (c->event == XFRM_MSG_DELSA) { 2105 struct nlattr *attr; 2106 2107 id = nlmsg_data(nlh); 2108 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 2109 id->spi = x->id.spi; 2110 id->family = x->props.family; 2111 id->proto = x->id.proto; 2112 2113 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); 2114 if (attr == NULL) 2115 goto nla_put_failure; 2116 2117 p = nla_data(attr); 2118 } 2119 2120 if (copy_to_user_state_extra(x, p, skb)) 2121 goto nla_put_failure; 2122 2123 nlmsg_end(skb, nlh); 2124 2125 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); 2126 2127 nla_put_failure: 2128 /* Somebody screwed up with xfrm_sa_len! */ 2129 WARN_ON(1); 2130 kfree_skb(skb); 2131 return -1; 2132 } 2133 2134 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c) 2135 { 2136 2137 switch (c->event) { 2138 case XFRM_MSG_EXPIRE: 2139 return xfrm_exp_state_notify(x, c); 2140 case XFRM_MSG_NEWAE: 2141 return xfrm_aevent_state_notify(x, c); 2142 case XFRM_MSG_DELSA: 2143 case XFRM_MSG_UPDSA: 2144 case XFRM_MSG_NEWSA: 2145 return xfrm_notify_sa(x, c); 2146 case XFRM_MSG_FLUSHSA: 2147 return xfrm_notify_sa_flush(c); 2148 default: 2149 printk("xfrm_user: Unknown SA event %d\n", c->event); 2150 break; 2151 } 2152 2153 return 0; 2154 2155 } 2156 2157 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x, 2158 struct xfrm_policy *xp) 2159 { 2160 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) 2161 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2162 + nla_total_size(xfrm_user_sec_ctx_size(x->security)) 2163 + userpolicy_type_attrsize(); 2164 } 2165 2166 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 2167 struct xfrm_tmpl *xt, struct xfrm_policy *xp, 2168 int dir) 2169 { 2170 struct xfrm_user_acquire *ua; 2171 struct nlmsghdr *nlh; 2172 __u32 seq = xfrm_get_acqseq(); 2173 2174 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 2175 if (nlh == NULL) 2176 return -EMSGSIZE; 2177 2178 ua = nlmsg_data(nlh); 2179 memcpy(&ua->id, &x->id, sizeof(ua->id)); 2180 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 2181 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 2182 copy_to_user_policy(xp, &ua->policy, dir); 2183 ua->aalgos = xt->aalgos; 2184 ua->ealgos = xt->ealgos; 2185 ua->calgos = xt->calgos; 2186 ua->seq = x->km.seq = seq; 2187 2188 if (copy_to_user_tmpl(xp, skb) < 0) 2189 goto nlmsg_failure; 2190 if (copy_to_user_state_sec_ctx(x, skb)) 2191 goto nlmsg_failure; 2192 if (copy_to_user_policy_type(xp->type, skb) < 0) 2193 goto nlmsg_failure; 2194 2195 return nlmsg_end(skb, nlh); 2196 2197 nlmsg_failure: 2198 nlmsg_cancel(skb, nlh); 2199 return -EMSGSIZE; 2200 } 2201 2202 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 2203 struct xfrm_policy *xp, int dir) 2204 { 2205 struct sk_buff *skb; 2206 2207 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); 2208 if (skb == NULL) 2209 return -ENOMEM; 2210 2211 if (build_acquire(skb, x, xt, xp, dir) < 0) 2212 BUG(); 2213 2214 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC); 2215 } 2216 2217 /* User gives us xfrm_user_policy_info followed by an array of 0 2218 * or more templates. 2219 */ 2220 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 2221 u8 *data, int len, int *dir) 2222 { 2223 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 2224 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 2225 struct xfrm_policy *xp; 2226 int nr; 2227 2228 switch (sk->sk_family) { 2229 case AF_INET: 2230 if (opt != IP_XFRM_POLICY) { 2231 *dir = -EOPNOTSUPP; 2232 return NULL; 2233 } 2234 break; 2235 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2236 case AF_INET6: 2237 if (opt != IPV6_XFRM_POLICY) { 2238 *dir = -EOPNOTSUPP; 2239 return NULL; 2240 } 2241 break; 2242 #endif 2243 default: 2244 *dir = -EINVAL; 2245 return NULL; 2246 } 2247 2248 *dir = -EINVAL; 2249 2250 if (len < sizeof(*p) || 2251 verify_newpolicy_info(p)) 2252 return NULL; 2253 2254 nr = ((len - sizeof(*p)) / sizeof(*ut)); 2255 if (validate_tmpl(nr, ut, p->sel.family)) 2256 return NULL; 2257 2258 if (p->dir > XFRM_POLICY_OUT) 2259 return NULL; 2260 2261 xp = xfrm_policy_alloc(GFP_KERNEL); 2262 if (xp == NULL) { 2263 *dir = -ENOBUFS; 2264 return NULL; 2265 } 2266 2267 copy_from_user_policy(xp, p); 2268 xp->type = XFRM_POLICY_TYPE_MAIN; 2269 copy_templates(xp, ut, nr); 2270 2271 *dir = p->dir; 2272 2273 return xp; 2274 } 2275 2276 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp) 2277 { 2278 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) 2279 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2280 + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) 2281 + userpolicy_type_attrsize(); 2282 } 2283 2284 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 2285 int dir, struct km_event *c) 2286 { 2287 struct xfrm_user_polexpire *upe; 2288 struct nlmsghdr *nlh; 2289 int hard = c->data.hard; 2290 2291 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 2292 if (nlh == NULL) 2293 return -EMSGSIZE; 2294 2295 upe = nlmsg_data(nlh); 2296 copy_to_user_policy(xp, &upe->pol, dir); 2297 if (copy_to_user_tmpl(xp, skb) < 0) 2298 goto nlmsg_failure; 2299 if (copy_to_user_sec_ctx(xp, skb)) 2300 goto nlmsg_failure; 2301 if (copy_to_user_policy_type(xp->type, skb) < 0) 2302 goto nlmsg_failure; 2303 upe->hard = !!hard; 2304 2305 return nlmsg_end(skb, nlh); 2306 2307 nlmsg_failure: 2308 nlmsg_cancel(skb, nlh); 2309 return -EMSGSIZE; 2310 } 2311 2312 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) 2313 { 2314 struct sk_buff *skb; 2315 2316 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); 2317 if (skb == NULL) 2318 return -ENOMEM; 2319 2320 if (build_polexpire(skb, xp, dir, c) < 0) 2321 BUG(); 2322 2323 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); 2324 } 2325 2326 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c) 2327 { 2328 struct xfrm_userpolicy_info *p; 2329 struct xfrm_userpolicy_id *id; 2330 struct nlmsghdr *nlh; 2331 struct sk_buff *skb; 2332 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 2333 int headlen; 2334 2335 headlen = sizeof(*p); 2336 if (c->event == XFRM_MSG_DELPOLICY) { 2337 len += nla_total_size(headlen); 2338 headlen = sizeof(*id); 2339 } 2340 len += userpolicy_type_attrsize(); 2341 len += NLMSG_ALIGN(headlen); 2342 2343 skb = nlmsg_new(len, GFP_ATOMIC); 2344 if (skb == NULL) 2345 return -ENOMEM; 2346 2347 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0); 2348 if (nlh == NULL) 2349 goto nlmsg_failure; 2350 2351 p = nlmsg_data(nlh); 2352 if (c->event == XFRM_MSG_DELPOLICY) { 2353 struct nlattr *attr; 2354 2355 id = nlmsg_data(nlh); 2356 memset(id, 0, sizeof(*id)); 2357 id->dir = dir; 2358 if (c->data.byid) 2359 id->index = xp->index; 2360 else 2361 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 2362 2363 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); 2364 if (attr == NULL) 2365 goto nlmsg_failure; 2366 2367 p = nla_data(attr); 2368 } 2369 2370 copy_to_user_policy(xp, p, dir); 2371 if (copy_to_user_tmpl(xp, skb) < 0) 2372 goto nlmsg_failure; 2373 if (copy_to_user_policy_type(xp->type, skb) < 0) 2374 goto nlmsg_failure; 2375 2376 nlmsg_end(skb, nlh); 2377 2378 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); 2379 2380 nlmsg_failure: 2381 kfree_skb(skb); 2382 return -1; 2383 } 2384 2385 static int xfrm_notify_policy_flush(struct km_event *c) 2386 { 2387 struct nlmsghdr *nlh; 2388 struct sk_buff *skb; 2389 2390 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); 2391 if (skb == NULL) 2392 return -ENOMEM; 2393 2394 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 2395 if (nlh == NULL) 2396 goto nlmsg_failure; 2397 if (copy_to_user_policy_type(c->data.type, skb) < 0) 2398 goto nlmsg_failure; 2399 2400 nlmsg_end(skb, nlh); 2401 2402 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); 2403 2404 nlmsg_failure: 2405 kfree_skb(skb); 2406 return -1; 2407 } 2408 2409 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) 2410 { 2411 2412 switch (c->event) { 2413 case XFRM_MSG_NEWPOLICY: 2414 case XFRM_MSG_UPDPOLICY: 2415 case XFRM_MSG_DELPOLICY: 2416 return xfrm_notify_policy(xp, dir, c); 2417 case XFRM_MSG_FLUSHPOLICY: 2418 return xfrm_notify_policy_flush(c); 2419 case XFRM_MSG_POLEXPIRE: 2420 return xfrm_exp_policy_notify(xp, dir, c); 2421 default: 2422 printk("xfrm_user: Unknown Policy event %d\n", c->event); 2423 } 2424 2425 return 0; 2426 2427 } 2428 2429 static inline size_t xfrm_report_msgsize(void) 2430 { 2431 return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); 2432 } 2433 2434 static int build_report(struct sk_buff *skb, u8 proto, 2435 struct xfrm_selector *sel, xfrm_address_t *addr) 2436 { 2437 struct xfrm_user_report *ur; 2438 struct nlmsghdr *nlh; 2439 2440 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 2441 if (nlh == NULL) 2442 return -EMSGSIZE; 2443 2444 ur = nlmsg_data(nlh); 2445 ur->proto = proto; 2446 memcpy(&ur->sel, sel, sizeof(ur->sel)); 2447 2448 if (addr) 2449 NLA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr); 2450 2451 return nlmsg_end(skb, nlh); 2452 2453 nla_put_failure: 2454 nlmsg_cancel(skb, nlh); 2455 return -EMSGSIZE; 2456 } 2457 2458 static int xfrm_send_report(u8 proto, struct xfrm_selector *sel, 2459 xfrm_address_t *addr) 2460 { 2461 struct sk_buff *skb; 2462 2463 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); 2464 if (skb == NULL) 2465 return -ENOMEM; 2466 2467 if (build_report(skb, proto, sel, addr) < 0) 2468 BUG(); 2469 2470 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC); 2471 } 2472 2473 static struct xfrm_mgr netlink_mgr = { 2474 .id = "netlink", 2475 .notify = xfrm_send_state_notify, 2476 .acquire = xfrm_send_acquire, 2477 .compile_policy = xfrm_compile_policy, 2478 .notify_policy = xfrm_send_policy_notify, 2479 .report = xfrm_send_report, 2480 .migrate = xfrm_send_migrate, 2481 }; 2482 2483 static int __init xfrm_user_init(void) 2484 { 2485 struct sock *nlsk; 2486 2487 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 2488 2489 nlsk = netlink_kernel_create(&init_net, NETLINK_XFRM, XFRMNLGRP_MAX, 2490 xfrm_netlink_rcv, NULL, THIS_MODULE); 2491 if (nlsk == NULL) 2492 return -ENOMEM; 2493 rcu_assign_pointer(xfrm_nl, nlsk); 2494 2495 xfrm_register_km(&netlink_mgr); 2496 2497 return 0; 2498 } 2499 2500 static void __exit xfrm_user_exit(void) 2501 { 2502 struct sock *nlsk = xfrm_nl; 2503 2504 xfrm_unregister_km(&netlink_mgr); 2505 rcu_assign_pointer(xfrm_nl, NULL); 2506 synchronize_rcu(); 2507 netlink_kernel_release(nlsk); 2508 } 2509 2510 module_init(xfrm_user_init); 2511 module_exit(xfrm_user_exit); 2512 MODULE_LICENSE("GPL"); 2513 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 2514 2515